Adog sled race is 25 miles long. the equation 5/8 k=25 can be used to estimate the race’s length k in kilometers. approximately how many hours will it take a dog sled team to finish the race if it travels at an average speed of 30 kilometers?

-8

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204